10kg weight gain in 1 month is likely to be mostly fat, and I don't think it's a realistic goal. Why do you want to gain 10kg in one month?

If you want to gain weight really quickly, just increase your calorie intake. Eat a lot of food. Drink a lot of milk.

If you want to gain weight in a way that will be good for you, you'll need to include a well-rounded strength training program such as Starting Strength or Stronglifts so that you turn those extra calories into muscle, rather than fat. Even on these programs, 10kg in one month is not realistic.